It's a question often asked in the photo section, and technology has moved on from a few years ago when it was last asked, so I thought it might be interesting to update things and see exactly what equipment people are using now.

This is what I currently have.

Canon 10D+Battery grip

Tokina 17mm f/3.5 AT-X Pro
Canon 50mm f1.8
Canon 28-70mm f2.8L
Sigma 105mm f2.8 EX Macro
Sigma 70-200mm f2.8 APO EX HSM
Sigma 2x APO EX Tele-Converter

Canon 550EX Speedlite
Canon 540EZ Speedlite
Prolinca 250 studio flash, plus a couple of softboxes

Slik PRO 700DX tripod
Manfrotto micro positioning plate
Kenko Extension tubes
and a few B+W filters, polariser, 81A and UV.

My most used lens is probably the macro or the 17mm. The lenses I use the least are the 28-70 and 70-200, which perversely were also the most expensive.

What camera are you using ?